It also depends on the shower sump design. If the shower sump drains into the bilge, then you can have some very nasty smells originating from the bilge, as all the dead skin cells, soap scum and hair can gather in the bilge and decay... makes great food for various molds/mildews/bacteria.
I would thoroughly clean and treat both the bilge and the head/holding tank system. Also, check to see if the head hoses are permeated—letting odor pass through them...by soaking a cotton towel in hot water and wrapping it around the hose, and then when the rag has cooled, taking it off and sniffing it. If it smells, then the hoses need replacement.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.